/*************************************************************************/
/*  semaphore.h                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
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/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef SEMAPHORE_H
#define SEMAPHORE_H

#include "error_list.h"

/**
	@author Juan Linietsky <reduzio@gmail.com>
*/
class Semaphore {
protected:
	static Semaphore* (*create_func)();

public:

	virtual Error wait()=0; ///< wait until semaphore has positive value, then decrement and pass
	virtual Error post()=0; ///< unlock the semaphore, incrementing the    value
	virtual int get() const=0; ///< get semaphore value

	static Semaphore * create(); ///< Create a mutex

	virtual ~Semaphore();
};


#endif
